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                <?php declare(strict_types = 1);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                namespace Churn\Managers;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Churn\Collections\FileCollection;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Churn\Factories\ProcessFactory;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Illuminate\Support\Collection;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                class ProcessManager  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * Collection of running processes.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @var Collection  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    private $runningProcesses;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * Collection of files.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @var FileCollection  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    private $filesCollection;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * Array of completed processes.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @var array  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    private $completedProcessesArray;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * Run the processes to gather information.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param FileCollection $filesCollection      Collection of files.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param ProcessFactory $processFactory       Process Factory.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param integer        $numberOfParallelJobs Number of parallel jobs to run.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @return Collection  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                     */  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    public function process(FileCollection $filesCollection, ProcessFactory $processFactory, int $numberOfParallelJobs): Collection  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    { | 
            
            
                                                                        
                            
            
                                    
            
            
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                        $this->filesCollection = $filesCollection;  | 
            
            
                                                                        
                            
            
                                    
            
            
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                        $this->processFactory = $processFactory;  | 
            
                            
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                        $this->runningProcesses = new Collection;  | 
            
            
                                                                        
                            
            
                                    
            
            
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                        $this->completedProcessesArray = [];  | 
            
            
                                                                        
                            
            
                                    
            
            
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                        while ($filesCollection->hasFiles() || $this->runningProcesses->count()) { | 
            
            
                                                                        
                            
            
                                    
            
            
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                            $this->getProcessResults($numberOfParallelJobs);  | 
            
            
                                                                        
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                        
                            
            
                                    
            
            
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                        return new Collection($this->completedProcessesArray);  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * Get the results of the processes.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param integer $numberOfParallelJobs Number of parallel jobs to run.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @return void  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    private function getProcessResults(int $numberOfParallelJobs)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        for ($index = $this->runningProcesses->count(); $this->filesCollection->hasFiles() > 0 && $index < $numberOfParallelJobs; $index++) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $file = $this->filesCollection->getNextFile();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $process = $this->processFactory->createGitCommitProcess($file);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $process->start();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $this->runningProcesses->put($process->getKey(), $process);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $process = $this->processFactory->createCyclomaticComplexityProcess($file);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $process->start();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $this->runningProcesses->put($process->getKey(), $process);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        foreach ($this->runningProcesses as $file => $process) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            if ($process->isSuccessful()) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                $this->runningProcesses->forget($process->getKey());  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                $this->completedProcessesArray[$process->getFileName()][$process->getType()] = $process;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                }  | 
            
            
                                                        
            
                                    
            
            
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In PHP it is possible to write to properties without declaring them. For example, the following is perfectly valid PHP code:
Generally, it is a good practice to explictly declare properties to avoid accidental typos and provide IDE auto-completion: